diff --git a/api/src/main/java/de/epiceric/shopchest/api/shop/Shop.java b/api/src/main/java/de/epiceric/shopchest/api/shop/Shop.java
index 1eba9e4..19d6abc 100644
--- a/api/src/main/java/de/epiceric/shopchest/api/shop/Shop.java
+++ b/api/src/main/java/de/epiceric/shopchest/api/shop/Shop.java
@@ -6,6 +6,7 @@ import org.bukkit.World;
 import org.bukkit.inventory.Inventory;
 
 import de.epiceric.shopchest.api.ShopManager;
+import de.epiceric.shopchest.api.exceptions.ChestNotFoundException;
 
 /**
  * Represents a shop
@@ -33,7 +34,7 @@ public interface Shop {
     OfflinePlayer getVendor();
 
     /**
-     * Gets the product this shop is buying or selling
+     * Gets a copy of the product this shop is buying or selling
      * 
      * @return the product
      * @since 1.13
@@ -72,9 +73,10 @@ public interface Shop {
      * Gets the inventory of this shop's chest
      * 
      * @return the inventory
+     * @throws ChestNotFoundException when there is no chest at the shop's location
      * @since 1.13
      */
-    Inventory getInventory();
+    Inventory getInventory() throws ChestNotFoundException;
 
     /**
      * Gets whether this shop is an admin shop
diff --git a/api/src/main/java/de/epiceric/shopchest/api/shop/ShopProduct.java b/api/src/main/java/de/epiceric/shopchest/api/shop/ShopProduct.java
index 73b5793..202b918 100644
--- a/api/src/main/java/de/epiceric/shopchest/api/shop/ShopProduct.java
+++ b/api/src/main/java/de/epiceric/shopchest/api/shop/ShopProduct.java
@@ -10,7 +10,7 @@ import org.bukkit.inventory.ItemStack;
 public interface ShopProduct {
 
     /**
-     * Gets the {@link ItemStack} with an amount of one
+     * Gets a copy of this product's {@link ItemStack} with an amount of one
      * 
      * @return the item
      * @since 1.13
@@ -18,9 +18,9 @@ public interface ShopProduct {
     ItemStack getItemStack();
 
     /**
-     * Sets the {@link ItemStack}
+     * Sets this product's {@link ItemStack}
      * <p>
-     * The passed item stack will be cloned and its amount set to one.
+     * The passed item stack will be copied and its amount set to one.
      * 
      * @param itemStack the item
      * @since 1.13